maven heisenbug : java.lang.AssertionError: Filling jar [...] during ZipFileIndexFileObject [...]

[gneuvill]

I hate maven. Here is the stacktrace :

java.lang.AssertionError: Filling jar:file:/home/gneuvill/.m2/repository/org/springframework/security/spring-security-config/4.1.3.RELEASE/spring-security-config-4.1.3.RELEASE.jar!/org/springframework/security/config/annotation/authentication/configuration/EnableGlobalAuthentication.class during ZipFileIndexFileObject[/home/gneuvill/.m2/repository/org/springframework/spring-context/4.2.8.RELEASE/spring-context-4.2.8.RELEASE.jar(org/springframework/stereotype/Component.class)] at com.sun.tools.javac.util.Assert.error(Assert.java:133) at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2500) at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2442) at com.sun.tools.javac.jvm.ClassReader.access$000(ClassReader.java:76) at com.sun.tools.javac.jvm.ClassReader$1.complete(ClassReader.java:240) at com.sun.tools.javac.code.Symbol.complete(Symbol.java:574) at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1037) at com.sun.tools.javac.code.Symbol$ClassSymbol.getRawAttributes(Symbol.java:984) at com.sun.tools.javac.code.Symbol.getAnnotationMirrors(Symbol.java:610) at com.sun.tools.javac.code.Symbol$TypeSymbol.getAnnotationMirrors(Symbol.java:672) at org.derive4j.processor.DeriveConfigBuilder.deriveConfigs(DeriveConfigBuilder.java:193) at org.derive4j.processor.DeriveConfigBuilder.lambda$deriveConfigs$11(DeriveConfigBuilder.java:195) at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.Iterator.forEachRemaining(Iterator.java:116) at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:742) at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.Iterator.forEachRemaining(Iterator.java:116) at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:479) at org.derive4j.processor.DeriveConfigBuilder.findDeriveConfig(DeriveConfigBuilder.java:177) at org.derive4j.processor.DerivingProcessor.lambda$process$3(DerivingProcessor.java:97) at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:419) at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:742) at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270) at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:747) at java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:721) at java.util.stream.AbstractTask.compute(AbstractTask.java:316) at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Something in there org.derive4j.processor.DeriveConfigBuilder.deriveConfigs(DeriveConfigBuilder.java:193) seems suspicious...

[jbgi]

It it systematic? or sporadic?
Does this happen during mvn compile?

[gneuvill]

Sporadic, hence the 'heisenbug' (not sure it really means what I think it means though).

Yes, mvn compile triggers it. I wonder if DerivingProcessor.findAllElements and DerivingProcessor.processElements are not the culprits here, both by using parallel() on "root" streams...

Indeed com.sun.tools.javac.jvm.ClassReader.fillIn, which throws the AssertionError, mutates a boolean declared in the class without any synchronisation whatsoever.

[jbgi]

right this is also the conclusion I reach. Need to avoid parallelization when traversing annotations chains (other usages are probably fine).